Institute Newton C. Braga

Circuit Bench

Two-Tone Generator 555 (CB21238E)
Found in Popular Electronics from the 90's, this circuit uses 555 integrated and common...
Frequency Divider With Unijunction Transistors (CB929E)
A low frequency divider can be made using common unijunction transistors as shown by the figure...
Comparator Photo Sensor (CB11588E)
This circuit triggers a relay when light strikes a sensor. The sensitivity is adjusted in the...